1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 /*static char sccsid[] = "from: @(#)invite.c 5.8 (Berkeley) 3/1/91";*/ 36 static char rcsid[] = "$Id: invite.c,v 1.2 1993/08/01 18:07:49 mycroft Exp $"; 37 #endif /* not lint */ 38 39 #include <sys/types.h> 40 #include <sys/socket.h> 41 #include <sys/time.h> 42 #include <signal.h> 43 #include <netinet/in.h> 44 #include <protocols/talkd.h> 45 #include <errno.h> 46 #include <setjmp.h> 47 #include "talk_ctl.h" 48 #include "talk.h" 49 50 /* 51 * There wasn't an invitation waiting, so send a request containing 52 * our sockt address to the remote talk daemon so it can invite 53 * him 54 */ 55 56 /* 57 * The msg.id's for the invitations 58 * on the local and remote machines. 59 * These are used to delete the 60 * invitations. 61 */ 62 int local_id, remote_id; 63 void re_invite(); 64 jmp_buf invitebuf; 65 66 invite_remote() 67 { 68 int nfd, read_mask, template, new_sockt; 69 struct itimerval itimer; 70 CTL_RESPONSE response; 71 72 itimer.it_value.tv_sec = RING_WAIT; 73 itimer.it_value.tv_usec = 0; 74 itimer.it_interval = itimer.it_value; 75 if (listen(sockt, 5) != 0) 76 p_error("Error on attempt to listen for caller"); 77 #ifdef MSG_EOR 78 /* copy new style sockaddr to old, swap family (short in old) */ 79 msg.addr = *(struct osockaddr *)&my_addr; /* XXX new to old style*/ 80 msg.addr.sa_family = htons(my_addr.sin_family); 81 #else 82 msg.addr = *(struct sockaddr *)&my_addr; 83 #endif 84 msg.id_num = htonl(-1); /* an impossible id_num */ 85 invitation_waiting = 1; 86 announce_invite(); 87 /* 88 * Shut off the automatic messages for a while, 89 * so we can use the interupt timer to resend the invitation 90 */ 91 end_msgs(); 92 setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0); 93 message("Waiting for your party to respond"); 94 signal(SIGALRM, re_invite); 95 (void) setjmp(invitebuf); 96 while ((new_sockt = accept(sockt, 0, 0)) < 0) { 97 if (errno == EINTR) 98 continue; 99 p_error("Unable to connect with your party"); 100 } 101 close(sockt); 102 sockt = new_sockt; 103 104 /* 105 * Have the daemons delete the invitations now that we 106 * have connected. 107 */ 108 current_state = "Waiting for your party to respond"; 109 start_msgs(); 110 111 msg.id_num = htonl(local_id); 112 ctl_transact(my_machine_addr, msg, DELETE, &response); 113 msg.id_num = htonl(remote_id); 114 ctl_transact(his_machine_addr, msg, DELETE, &response); 115 invitation_waiting = 0; 116 } 117 118 /* 119 * Routine called on interupt to re-invite the callee 120 */ 121 void 122 re_invite() 123 { 124 125 message("Ringing your party again"); 126 current_line++; 127 /* force a re-announce */ 128 msg.id_num = htonl(remote_id + 1); 129 announce_invite(); 130 longjmp(invitebuf, 1); 131 } 132 133 static char *answers[] = { 134 "answer #0", /* SUCCESS */ 135 "Your party is not logged on", /* NOT_HERE */ 136 "Target machine is too confused to talk to us", /* FAILED */ 137 "Target machine does not recognize us", /* MACHINE_UNKNOWN */ 138 "Your party is refusing messages", /* PERMISSION_REFUSED */ 139 "Target machine can not handle remote talk", /* UNKNOWN_REQUEST */ 140 "Target machine indicates protocol mismatch", /* BADVERSION */ 141 "Target machine indicates protocol botch (addr)",/* BADADDR */ 142 "Target machine indicates protocol botch (ctl_addr)",/* BADCTLADDR */ 143 }; 144 #define NANSWERS (sizeof (answers) / sizeof (answers[0])) 145 146 /* 147 * Transmit the invitation and process the response 148 */ 149 announce_invite() 150 { 151 CTL_RESPONSE response; 152 153 current_state = "Trying to connect to your party's talk daemon"; 154 ctl_transact(his_machine_addr, msg, ANNOUNCE, &response); 155 remote_id = response.id_num; 156 if (response.answer != SUCCESS) { 157 if (response.answer < NANSWERS) 158 message(answers[response.answer]); 159 quit(); 160 } 161 /* leave the actual invitation on my talk daemon */ 162 ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response); 163 local_id = response.id_num; 164 } 165 166 /* 167 * Tell the daemon to remove your invitation 168 */ 169 send_delete() 170 { 171 172 msg.type = DELETE; 173 /* 174 * This is just a extra clean up, so just send it 175 * and don't wait for an answer 176 */ 177 msg.id_num = htonl(remote_id); 178 daemon_addr.sin_addr = his_machine_addr; 179 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 180 (struct sockaddr *)&daemon_addr, 181 sizeof (daemon_addr)) != sizeof(msg)) 182 perror("send_delete (remote)"); 183 msg.id_num = htonl(local_id); 184 daemon_addr.sin_addr = my_machine_addr; 185 if (sendto(ctl_sockt, &msg, sizeof (msg), 0, 186 (struct sockaddr *)&daemon_addr, 187 sizeof (daemon_addr)) != sizeof (msg)) 188 perror("send_delete (local)"); 189 } 190